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TRANSCRIPT
CLOCK
Sephiroth Kwon
GRMA
20-05-2009
OUTLINE
• Clock Distribution Diagram
• Signal Description
• Repair Flow Chart
• Repair Technique
CLOCK Distribution Diagram
Clock
Chip
Intel
BearLake
GMCH
Intel
ICH9
Intel
LGA775
W83667EHF
Attansic L1
PCIEx1 Slot
PCIEx16 Slot
DDR2 1,2,3,4
AUDIO Code
PCI Slot
VIA6308
TPM
CK_33MHZ
CPUHCLK
200/266/333MHZ
MCHHCLK/# 200/266MHZ
CK_100M_MCH/# 100MHZ
CK_96M_DREF/# 96MHZ
CK_100M_ICH/# 100MHZ
CK_100M_SATA/# 100MHZ
CK_33M_ICH/# 33MHZ
CK_48M_USB/# 48MHZ
CK_14M_ICH/# 14.318MHZ
CK_100M_PE16/# 100MHZ
CK_100M_PE1/# 100MHZ
CK_100M_PE1/# 100MHZ
CK_48M_SIO 48MHZ
CK_33M_SIO 33MHZ
BITCLK 24MHZ
M_CHB_CLK/#P5Q Deluxe
CLOCK Distribution Diagram
M4N78 AM
CLOCK Distribution Diagram
M4A79 DELUX
Signal Description
Clock
Generator
14.318 MHZ
Inductor
3V
3V
Diode
1.Sometimes the Clock chip connect one Diode or BJT
component. It depends on designer.
PG
Clock
Generator
14.318 MHZ
Inductor
3V
3V
PGBJT
South
Bridge
Figure A.Figure B.SLP_S3# SLP_S3#
Signal Description
• Sometimes we can find BAT54AW near ICS.
• VRMPWRGD and SLP_S3# must be 3V
• Finally, CLKVCC offer 3V PWRGD to Clock
Generator .
• If Clock Generator doesn’t work, you must measure
this PWRGD signal first.
CD2
BAT54AW
1
23
R_ICH_VRMPWRGD(25)
SLP_S3#(25,34)
CRN1D
8.2KOHM
78
CLKVCC3
C_PG
Repair Flow Chart
START
Visual Inspection
check CLK Gen. and related small
components are ok
Change damaged CLK
Gen.& NG components
Measure CLK Gen. Voltage InputCheck CLK Vcc 3V &
related trace component
Fix any trace open and
change any NG RLC
component
Change CLK Generator
Measure X’TAL 14.318Mhz is okCheck X’TAL & related
two Capacitors are ok
Change NG X’TAL or
Capacitor
Check which CLK signal is wrong
Trace the circuit, check
related trace & resistor,
capacitor
Fix any trace open and
change any NG RLC
component
Finished
OK
OK
OK
OK
NG
NG
NG
NG
NG
OK
OK
OK
OK
NG
NG
NG
Repair Technique-Visual Inspection
1
Visual Inspection to check Clock
Generator and related small
components are not damaged.
Repair Technique-Measure Vcc_CLK
2
Use Multi-Meter or Oscilloscope to
measure Clock voltage 3.3V is ok.
Repair Technique-Measure CLK X’TAL
3-1
3-2
Use Oscilloscope to measure
Clock X’TAL 14.318Mhz is ok.
Repair Technique-Check Individual NG signal
4
Use Oscilloscope to
measure every individual
CLK signal. If find error
please trace the circuit to
find it’s connection.
If related RLC components
are ok but CLK still is NG
please try to change CLK
generator at last.
Thank You!